diff --git a/doc/src/sgml/release-19.sgml b/doc/src/sgml/release-19.sgml
index 285bfa123f6..4943885cf01 100644
--- a/doc/src/sgml/release-19.sgml
+++ b/doc/src/sgml/release-19.sgml
@@ -109,7 +109,18 @@ Force <link linkend="guc-standard-conforming-strings"><varname>standard_conformi
 </para>
 
 <para>
-Server variable <varname>escape_string_warning</varname> has been removed as unnecessary.  Client applications still support <literal>escape_string_warning = off</literal> for compatibility with old servers.
+This carries some risk for upgrades: a dump file produced by
+pre-v19 <application>pg_dump</application> from a server that
+had <literal>standard_conforming_strings = off</literal>
+will not restore correctly into v19 or later.  Use
+v19 <application>pg_dump</application> to take the dump, or
+set <literal>standard_conforming_strings = on</literal>
+in the old server before dumping.
+Client applications still support operations with servers
+having <literal>standard_conforming_strings = off</literal>, for
+compatibility with old servers.
+Server variable <varname>escape_string_warning</varname> has been removed
+as unnecessary.
 </para>
 </listitem>